Abstract
The general solution of the Einstein field equation is obtained under the assumptions that (1) the source of the gravitational field is a perfect fluid with pressure p, equal to energy density ρ, (2) the space–time is cylindrically symmetric, and (3) the metric is given by three functions of two variables. The coordinate transformation to comoving coordinates is discussed. The energy and the Hawking–Penrose inequalities are studied. The singularities of a class of solutions is studied using the concept of velocity‐dominated singularity. A relation between Einstein–Rosen waves and a class of solutions is shown.

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